bump: minor
type: feat
Builtin Platformer controller (#58) — the reference implementation of the six-lever extensibility contract, shipped as the source package **ludic.platformer**. Movement feel is all defaulted POD data (`Platformer { move_speed, jump_height, apex_frames, fall_gravity_mul, coyote_frames, jump_buffer_frames, air_jumps, policy, … }`); the controller is decomposed into small engine-owned sub-systems — input (Input phase), move/gravity/jump (FixedUpdate, before the shared `esys_move` sweep) and animation-state (LateUpdate, after it) — each independently switch-off-able with `disable system <fn>`. It owns movement *policy* only and reuses the engine Body/Collider swept-AABB collision. Jump feel derives gravity + impulse from height/apex, with coyote time, jump buffering, variable jump height and multi-jump; every jump decision emits a `cancellable JumpRequested` / `JumpPerformed` / `Landed` / `StateChanged` event, and a gravity `policy` enum (asymmetric / symmetric / floaty) is the formula hook. Ships the opt-in game-loop layer too (`scaffolding.ludic`): moving & crumbling platform blocks with rider carry, collectibles + `Score`, springs, hazards + a light `Life`/i-frames model, and checkpoint/goal triggers. Deterministic integer Q16.16 throughout. Examples: `examples/games/platformer_demo.ludic`, `examples/games/platformer_scaffolding.ludic`. Also fixes a latent codegen bug in `ludic_sweep_entity` (an SSA register name collided once a program declared ≥11 events).